Motor Oil in gas tank!

[RobertJR]

Was rushing today and not paying attention when I went to fill up the gas in my 1999 Lund with a 100hp 1999 Yamaha outboard and intended to grab the fuel additive and instead grabbed a quart of 5w30 motor oil I had in my trunk. I know - totally stupid - both containers are black. Anyways I poured about 1/10th to 1/20th of the quart into the gas tank. I realized what I did and really couldn’t do anything at that point other than fill up with gas. It was 6 gallons low (27 gallon tank).

My question: Do I just do nothing and it will just burn off or will it cause any damage to the engine? I plan to fill up the gas after every use ( usually burn 3-5 gallons per trip) to further dilute it over time.

Can’t believe I did this and feel like an idiot.

[panasonic]

Won't hurt a thing...keep on trucking!

[RobertJR]

Thank you! Two other mechanics told me the same thing.

[amahaork]

four cycle motor oil has higher resistance to burn, than two cycle motor oil, that burns comparatively easy. burning four cycle oil in two cycle motors will result in a massive carbon build up, compared to lower carbon buildup - all variations equal - especially off piston rings. of course mechanics tells you it's ok. marinas no longer repair engines, but replaced them.

[amahaork]

may be its ok for short time, diluted

[99yam40]

1, 2, or 3 ozs of that oil in 20 gallons of gas is nothing to be worried about